lemmy/server/src/db/community_view.rs

use super::community_view::community_view::BoxedQuery;
use crate::db::{fuzzy_search, limit_and_offset, MaybeOptional, SortType};
use diesel::{pg::Pg, result::Error, *};
use serde::{Deserialize, Serialize};

table! {
  community_view (id) {
    id -> Int4,
    name -> Varchar,
    title -> Varchar,
    description -> Nullable<Text>,
    category_id -> Int4,
    creator_id -> Int4,
    removed -> Bool,
    published -> Timestamp,
    updated -> Nullable<Timestamp>,
    deleted -> Bool,
    nsfw -> Bool,
    actor_id -> Text,
    local -> Bool,
    last_refreshed_at -> Timestamp,
    creator_actor_id -> Text,
    creator_local -> Bool,
    creator_name -> Varchar,
    creator_avatar -> Nullable<Text>,
    category_name -> Varchar,
    number_of_subscribers -> BigInt,
    number_of_posts -> BigInt,
    number_of_comments -> BigInt,
    hot_rank -> Int4,
    user_id -> Nullable<Int4>,
    subscribed -> Nullable<Bool>,
  }
}

table! {
  community_moderator_view (id) {
    id -> Int4,
    community_id -> Int4,
    user_id -> Int4,
    published -> Timestamp,
    user_actor_id -> Text,
    user_local -> Bool,
    user_name -> Varchar,
    avatar -> Nullable<Text>,
    community_actor_id -> Text,
    community_local -> Bool,
    community_name -> Varchar,
  }
}

table! {
  community_follower_view (id) {
    id -> Int4,
    community_id -> Int4,
    user_id -> Int4,
    published -> Timestamp,
    user_actor_id -> Text,
    user_local -> Bool,
    user_name -> Varchar,
    avatar -> Nullable<Text>,
    community_actor_id -> Text,
    community_local -> Bool,
    community_name -> Varchar,
  }
}

table! {
  community_user_ban_view (id) {
    id -> Int4,
    community_id -> Int4,
    user_id -> Int4,
    published -> Timestamp,
    user_actor_id -> Text,
    user_local -> Bool,
    user_name -> Varchar,
    avatar -> Nullable<Text>,
    community_actor_id -> Text,
    community_local -> Bool,
    community_name -> Varchar,
  }
}

#[derive(
  Queryable, Identifiable, PartialEq, Debug, Serialize, Deserialize, QueryableByName, Clone,
)]
#[table_name = "community_view"]
pub struct CommunityView {
  pub id: i32,
  pub name: String,
  pub title: String,
  pub description: Option<String>,
  pub category_id: i32,
  pub creator_id: i32,
  pub removed: bool,
  pub published: chrono::NaiveDateTime,
  pub updated: Option<chrono::NaiveDateTime>,
  pub deleted: bool,
  pub nsfw: bool,
  pub actor_id: String,
  pub local: bool,
  pub last_refreshed_at: chrono::NaiveDateTime,
  pub creator_actor_id: String,
  pub creator_local: bool,
  pub creator_name: String,
  pub creator_avatar: Option<String>,
  pub category_name: String,
  pub number_of_subscribers: i64,
  pub number_of_posts: i64,
  pub number_of_comments: i64,
  pub hot_rank: i32,
  pub user_id: Option<i32>,
  pub subscribed: Option<bool>,
}

pub struct CommunityQueryBuilder<'a> {
  conn: &'a PgConnection,
  query: BoxedQuery<'a, Pg>,
  sort: &'a SortType,
  from_user_id: Option<i32>,
  show_nsfw: bool,
  search_term: Option<String>,
  page: Option<i64>,
  limit: Option<i64>,
}

impl<'a> CommunityQueryBuilder<'a> {
  pub fn create(conn: &'a PgConnection) -> Self {
    use super::community_view::community_view::dsl::*;

    let query = community_view.into_boxed();

    CommunityQueryBuilder {
      conn,
      query,
      sort: &SortType::Hot,
      from_user_id: None,
      show_nsfw: true,
      search_term: None,
      page: None,
      limit: None,
    }
  }

  pub fn sort(mut self, sort: &'a SortType) -> Self {
    self.sort = sort;
    self
  }

  pub fn for_user<T: MaybeOptional<i32>>(mut self, from_user_id: T) -> Self {
    self.from_user_id = from_user_id.get_optional();
    self
  }

  pub fn show_nsfw(mut self, show_nsfw: bool) -> Self {
    self.show_nsfw = show_nsfw;
    self
  }

  pub fn search_term<T: MaybeOptional<String>>(mut self, search_term: T) -> Self {
    self.search_term = search_term.get_optional();
    self
  }

  pub fn page<T: MaybeOptional<i64>>(mut self, page: T) -> Self {
    self.page = page.get_optional();
    self
  }

  pub fn limit<T: MaybeOptional<i64>>(mut self, limit: T) -> Self {
    self.limit = limit.get_optional();
    self
  }

  pub fn list(self) -> Result<Vec<CommunityView>, Error> {
    use super::community_view::community_view::dsl::*;

    let mut query = self.query;

    if let Some(search_term) = self.search_term {
      let searcher = fuzzy_search(&search_term);
      query = query
        .filter(name.ilike(searcher.to_owned()))
        .or_filter(title.ilike(searcher.to_owned()))
        .or_filter(description.ilike(searcher));
    };

    // The view lets you pass a null user_id, if you're not logged in
    match self.sort {
      SortType::Hot => {
        query = query
          .order_by(hot_rank.desc())
          .then_order_by(number_of_subscribers.desc())
          .filter(user_id.is_null())
      }
      SortType::New => query = query.order_by(published.desc()).filter(user_id.is_null()),
      SortType::TopAll => match self.from_user_id {
        Some(from_user_id) => {
          query = query
            .filter(user_id.eq(from_user_id))
            .order_by((subscribed.asc(), number_of_subscribers.desc()))
        }
        None => {
          query = query
            .order_by(number_of_subscribers.desc())
            .filter(user_id.is_null())
        }
      },
      _ => (),
    };

    if !self.show_nsfw {
      query = query.filter(nsfw.eq(false));
    };

    let (limit, offset) = limit_and_offset(self.page, self.limit);
    query
      .limit(limit)
      .offset(offset)
      .filter(removed.eq(false))
      .filter(deleted.eq(false))
      .load::<CommunityView>(self.conn)
  }
}

impl CommunityView {
  pub fn read(
    conn: &PgConnection,
    from_community_id: i32,
    from_user_id: Option<i32>,
  ) -> Result<Self, Error> {
    use super::community_view::community_view::dsl::*;

    let mut query = community_view.into_boxed();

    query = query.filter(id.eq(from_community_id));

    // The view lets you pass a null user_id, if you're not logged in
    if let Some(from_user_id) = from_user_id {
      query = query.filter(user_id.eq(from_user_id));
    } else {
      query = query.filter(user_id.is_null());
    };

    query.first::<Self>(conn)
  }
}

#[derive(
  Queryable, Identifiable, PartialEq, Debug, Serialize, Deserialize, QueryableByName, Clone,
)]
#[table_name = "community_moderator_view"]
pub struct CommunityModeratorView {
  pub id: i32,
  pub community_id: i32,
  pub user_id: i32,
  pub published: chrono::NaiveDateTime,
  pub user_actor_id: String,
  pub user_local: bool,
  pub user_name: String,
  pub avatar: Option<String>,
  pub community_actor_id: String,
  pub community_local: bool,
  pub community_name: String,
}

impl CommunityModeratorView {
  pub fn for_community(conn: &PgConnection, from_community_id: i32) -> Result<Vec<Self>, Error> {
    use super::community_view::community_moderator_view::dsl::*;
    community_moderator_view
      .filter(community_id.eq(from_community_id))
      .load::<Self>(conn)
  }

  pub fn for_user(conn: &PgConnection, from_user_id: i32) -> Result<Vec<Self>, Error> {
    use super::community_view::community_moderator_view::dsl::*;
    community_moderator_view
      .filter(user_id.eq(from_user_id))
      .load::<Self>(conn)
  }
}

#[derive(
  Queryable, Identifiable, PartialEq, Debug, Serialize, Deserialize, QueryableByName, Clone,
)]
#[table_name = "community_follower_view"]
pub struct CommunityFollowerView {
  pub id: i32,
  pub community_id: i32,
  pub user_id: i32,
  pub published: chrono::NaiveDateTime,
  pub user_actor_id: String,
  pub user_local: bool,
  pub user_name: String,
  pub avatar: Option<String>,
  pub community_actor_id: String,
  pub community_local: bool,
  pub community_name: String,
}

impl CommunityFollowerView {
  pub fn for_community(conn: &PgConnection, from_community_id: i32) -> Result<Vec<Self>, Error> {
    use super::community_view::community_follower_view::dsl::*;
    community_follower_view
      .filter(community_id.eq(from_community_id))
      .load::<Self>(conn)
  }

  pub fn for_user(conn: &PgConnection, from_user_id: i32) -> Result<Vec<Self>, Error> {
    use super::community_view::community_follower_view::dsl::*;
    community_follower_view
      .filter(user_id.eq(from_user_id))
      .load::<Self>(conn)
  }
}

#[derive(
  Queryable, Identifiable, PartialEq, Debug, Serialize, Deserialize, QueryableByName, Clone,
)]
#[table_name = "community_user_ban_view"]
pub struct CommunityUserBanView {
  pub id: i32,
  pub community_id: i32,
  pub user_id: i32,
  pub published: chrono::NaiveDateTime,
  pub user_actor_id: String,
  pub user_local: bool,
  pub user_name: String,
  pub avatar: Option<String>,
  pub community_actor_id: String,
  pub community_local: bool,
  pub community_name: String,
}

impl CommunityUserBanView {
  pub fn for_community(conn: &PgConnection, from_community_id: i32) -> Result<Vec<Self>, Error> {
    use super::community_view::community_user_ban_view::dsl::*;
    community_user_ban_view
      .filter(community_id.eq(from_community_id))
      .load::<Self>(conn)
  }

  pub fn for_user(conn: &PgConnection, from_user_id: i32) -> Result<Vec<Self>, Error> {
    use super::community_view::community_user_ban_view::dsl::*;
    community_user_ban_view
      .filter(user_id.eq(from_user_id))
      .load::<Self>(conn)
  }

  pub fn get(
    conn: &PgConnection,
    from_user_id: i32,
    from_community_id: i32,
  ) -> Result<Self, Error> {
    use super::community_view::community_user_ban_view::dsl::*;
    community_user_ban_view
      .filter(user_id.eq(from_user_id))
      .filter(community_id.eq(from_community_id))
      .first::<Self>(conn)
  }
}